package com.deschen.security.core.validate.code.image;

import com.deschen.security.core.properties.ImageCodeProperties;
import com.deschen.security.core.properties.SecurityProperties;
import com.deschen.security.core.validate.code.generator.ValidateCodeGenerator;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * @Author deschen
 * @Create 2019/8/18
 * @Description 图片验证码生成器
 * @Since 1.0.0
 */
@Data
@Slf4j
public class ImageValidateCodeGenerator implements ValidateCodeGenerator {

    private SecurityProperties securityProperties;

    @Override
    public ImageValidateCode createValidateCode(ServletWebRequest servletWebRequest) {
        ImageCodeProperties imageProperties = securityProperties.getCode().getImage();
        int width = ServletRequestUtils.getIntParameter(servletWebRequest.getRequest(), "width",
                imageProperties.getWidth());
        int height = ServletRequestUtils.getIntParameter(servletWebRequest.getRequest(), "height",
                imageProperties.getHeight());
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics g = image.getGraphics();

        Random random = new Random();

        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ITALIC, 20));
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        String sRand = "";
        for (int i = 0; i < imageProperties.getLength(); i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 13 * i + 6, 16);
        }

        g.dispose();
        log.info("【图片验证码】 验证码：" + sRand);
        return new ImageValidateCode(image, sRand, imageProperties.getExpireIn());
    }




    /**
     * 生成随机背景条纹
     *
     * @param fc
     * @param bc
     * @return
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}
